I have a normal probability distribution question which does not have the - XP Math - Forums

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 07-30-2007 #1 toni.chang Guest   Posts: n/a I have a normal probability distribution question which does not have the standard deviation provided. Help!? Use the sales forecaster's prediction to describe a normal probability distribution that can be used to approximate the demand distribution. Sketch the distribution and how its mean and standard deviation.Provided information: Sales forecaser predicts an expected demand of 20,000 units with a 0.90 probability that demand would be between 10,000 units and 30,000 units. What is the standard deviation?
 07-30-2007 #2 Wiggle J Guest   Posts: n/a The formula is square root of (b-a) squared/12.Another formula is 2* sqrt 3 - meanBoth should get you the same answer if computed properly.

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